An electronic device based on gold nanoparticles and tetraruthenated porphyrin as an electrochemical sensor for catechol

作者：Sousa Luana M; Vilarinho Luana M; Ribeiro Gabriel H; Bogado Andre L; Dinelli Luis R

来源：Royal Society Open Science, 2017, 4(12): 170675.

DOI：10.1098/rsos.170675

<jats:p>
The aim of this study was to obtain an electrochemical device between the electrostatic interaction of the electropolymerized porphyrin {CoTPyP[RuCl
<jats:sub>3</jats:sub>
(dppb)]
<jats:sub>4</jats:sub>
}, where TPyP = 5,10,15, 20-tetrapyridilphorphyrin and dppb = 1,4-bis(diphenylphosphino)butane, and gold nanoparticles (AuNPs
<jats:sup>n−</jats:sup>
), to be used as a voltammetric sensor to determine catechol (CC). The modified electrode, labelled as [(CoTPRu
<jats:sub>4</jats:sub>
)
<jats:sub arrange="stack">n</jats:sub>
<jats:sup arrange="stack">8+</jats:sup>
-BE]/AuNPs
<jats:sup>n−</jats:sup>
{where BE = bare electrode = glassy carbon electrode (GCE) or indium tin oxide (ITO)}, was made layer-by-layer. Initially, a cationic polymeric film was generated by electropolymerization of the {CoTPyP[RuCl
<jats:sub>3</jats:sub>
(dppb)]
<jats:sub>4</jats:sub>
} onto the surface of the bare electrode to produce an intermediary electrode [(CoTPRu
<jats:sub>4</jats:sub>
)
<jats:sub arrange="stack">n</jats:sub>
<jats:sup arrange="stack">8+</jats:sup>
-BE]. Making the final electronic device also involves coating the electrode [(CoTPRu
<jats:sub>4</jats:sub>
)
<jats:sub arrange="stack">n</jats:sub>
<jats:sup arrange="stack">8+</jats:sup>
-BE] using a colloidal suspension of AuNPs
<jats:sup>n−</jats:sup>
by electrostatic interaction between the species. Therefore, a bilayer labelled as [(CoTPRu
<jats:sub>4</jats:sub>
)
<jats:sub arrange="stack">n</jats:sub>
<jats:sup arrange="stack">8+</jats:sup>
-BE]/AuNPs
<jats:sup>n−</jats:sup>
was produced and used as an electrochemical sensor for CC determination. The electrochemical behaviour of CC was investigated using cyclic voltammetry at [(CoTPRu
<jats:sub>4</jats:sub>
)
<jats:sub arrange="stack">n</jats:sub>
<jats:sup arrange="stack">8+</jats:sup>
-GCE]/AuNPs
<jats:sup>n−</jats:sup>
electrode. Compared to the GCE, the [(CoTPRu
<jats:sub>4</jats:sub>
)
<jats:sub arrange="stack">n</jats:sub>
<jats:sup arrange="stack">8+</jats:sup>
-GCE]/AuNPs
<jats:sup>n−</jats:sup>
showed higher electrocatalytic activity towards the oxidation of CC. Under the optimized conditions, the calibration curves for CC were 21–1357 µmol l
<jats:sup>−1</jats:sup>
with a high sensitivity of 108 µA µmol l
<jats:sup>−1</jats:sup>
 cm
<jats:sup>−2</jats:sup>
. The detection limit was 1.4 µmol l
<jats:sup>−1</jats:sup>
.
</jats:p>

• 出版日期2017-11